Fix -Wmicrosoft-unqualified-friend warning.
The warning complains that StringThreadTest is declared in the global namespace,
but the friend line says `friend class StringThreadTest;` instead of
`friend class ::StringThreadTest`. MSVC doesn't require this ::, but gcc does
-- without it, the friend line declares a new class in the namespace containing
UnicodeString.
Since StringThreadTest was in test/threadtest which isn't built as part of
Chromium's build and which was removed in upstream ICU in ICU 37392, just
delete the friend line, it has no effect.
BUG=505296
R=jshin@chromium.org
Review URL: https://codereview.chromium.org/1317603003 .
3 files changed
